Inertization of waste material contaminated with heavy metals
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United States of America Patent
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Mar 18, 2003
Grant Date -
N/A
app pub date -
Nov 14, 2000
filing date -
Mar 4, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method for treating waste material contaminated with heavy metals so as to make it inert, characterized in that the material to be made inert, optionally at least in part neutralized, is subjected to the following operations, optionally under stirring: addition of a concentrate aqueous solution of orthophosphoric acid and an alkaline or alkaline earth salt thereof in a molar ration ranging from 1:5 to 5:1; optionally addition of water to give the homogeneous paste thus obtained a sufficient moisture content; addition of calcium hydroxide and/or calcium oxide; the resulting homogeneous paste being placed in the open air to help it dry out. The material thus obtained is fit to be disposed according to local environmental legislation.
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